[GRASS-user] wierd artifacts in DEM from seamless.usgs.gov

[Hamish]

> downloaded a 1/3 arc-second (about 10m res) DEM from the
> seamless.usgs.gov site. 
> 
> projected the lat/lon raster to UTM via gdalwarp using the -tps option
> 
> import into grass, and compute shaded relief... and it looks like
> crap: http://169.237.35.250/~dylan/temp/seamless_dem_artifacts.png


Is the artifact seen in the raw data downloaded from USGS? Is gdalwarp
for sure the culprit?



Hamish